George, I've been doing a lot of research in the Heidelberg area. My main lines are Rex or Blose. My cousin is a Fritzinger and I said I'd start looking for her. I have a compilation of records for the Heidelberg Church. The first entry in the section for the Reformed Church, (Heidelberg was both Reformed & Luthern) I found is for the baptism of Andreas Fritzinger. Son of Ernst and wife, born 3.17.1782, no sponsors were listed. Another son listed is Jacob born 3.13.1797 (no sponsors). In the 1810's and 20's there are children listed for Matheas Fritzinger & Elisabeth Ross. Also in the early 20's Andreas has children with his wife Elisabeth (no maiden name given). Then Jacob starts in the mid 20's with his wife Catharina.
Then in the Luthern section I found a Susanna Fritzinger born 4.22.1801 to Johannes & Elisabeth Fritzinger. The sposors of her baptism were Jacob & Susanna Fritzinger. In 1808 I found a son Jonas born on Dec 17 and bap on 1.29.1809 to the same couple. The sponsors here were Matheias Fritzinger and Maria Neff, both single. Another son named Jesse on 4.23.1811, bap 5.26.1811, sponsors were Johannes and Anna Neff. (I'm thinking that Elisabeth may have been a Neff???)
I can find no record of Christian for that year in either congregation.
I also have a copy of the Heidelberg Cemetery. There are references for the following Fritzingers: Andreas, Anna, Anna A., A. Maria, Carolin, Catharina, Elias, Elisabeth, Esra, George, Jacob, Lydia, Matilda, Nathan, Rosa, Salome, Sarah Ann and Stephen. These are located in the older section of the cemetery. There are more in the new section.
If you find a connection or would like any other names looked up please email me.